every three yearsThere are some peaks in the price:
AO 2011 (1)(a) 2014 (1)(b) 2017 (2)(c) 2021 (2)(d)
Zn 0.97 1.04 1.48 1.23
stocks 850k 650k 220k 200k
TV 1.70 1.20 1.50 ?
(1) with caribou and without africans
(2) with caribou and with africans
(a) jul 2011
(b) jul 2014
(c) dec 2017
(d) abr 2021